Taxes Paid to Another State

I live in MA, but my employer erroneously withheld taxes for MD for part of the year. I have completed the MD non-resident tax form. I am working on the MA resident tax form and the section on "Taxes paid to another state" is confusing - please help. 

Other jurisdiction: Taxes paid to "Maryland (MD)"

Income taxed by Maryland

a) Enter the total amount of 5% income on which you paid taxes to Maryland

• Where do I find or how do I calculate the "total amount of 5% income"?

b) Enter the actual tax owed from the other state tax return for the income reported in both states.

• What is the "actual tax owed"?
• When I completed the MD non-resident tax form, I see "0" tax due for MD and I show a refund for all the taxes withheld for the MD wages. I think I indicate "0" for the actual taxes owed. Is this correct?

I am using TurboTax Premium, online version.